Earlier quoted context omitted.
"Nobody knows how to issue this command or knows if this command works on their drive off the top of their heads." Sure they do. You overwrite the drive with a known large file and then check the checksum of it. It doesn't matter what kind of mumbo-jumbo the SSD is doing - it doesn't have phantom-double-capacity hiding in there ... if the (drive sized file) you wrote checksums out, you're done. And if you're paranoid…
No. See eg. https://www.usenix.org/legacy/events/fast11/tech/full_papers...
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